Nutrient Cycling in Agroecosystems

, Volume 55, Issue 2, pp 123–131 | Cite as

Effect of composting time on phosphate exchangeability

  • O. Traoré
  • S. Sinaj
  • E. Frossard
  • J.M. Van De Kerkhove


Because of their high concentrations in organic matter and nutrients, composts have been used as soil amendments for years. However, information on their P availability is scarce. The effect of the composting time on phosphate exchangeability of composts was assessed on three substrates (House Refuse Compost, HRC; Sewage Sludge Compost, SSC; and Food Waste Compost, FWC) using the isotopic exchange kinetic method proposed by Fardeau (1996). Results were then interpreted by a pluricompartmental analysis and compared to those yielded by a sequential extraction. Preliminary results confirmed that the isotopic exchange kinetic method was appropriate to assess phosphate exchangeability of composts. Composts were shown to have a low buffering capacity (r(1)/R) for inorganic P (Pi) and high concentration in water extractable Pi (Cp) and in Pi isotopically exchangeable within 1 min (E1min) compared to soils. Their concentra tion in Pi isotopically exchangeable between 1min and 3 months (Ei1min−3months) and in Pi which cannot be exchanged within three months (E>3months) was a function of their origin. Composting of HRC, SSC, and FWC, systematically led to decreases in Cp and E1min with time and in some cases to increases in Ei1min−3months and/or in E>3months. These changes were related to the leaching of water soluble Pi from the HRC and FWC composts and, for the SSC and FWC composts, to the formation of phosphate precipitates with Ca, Mg and/or Fe during composting. Most of the changes in Pi exchangeability occurred during the first month of composting, i.e., during the most intense period of organic matter mineralisation. The slight increase in total organic P content observed after 180 d of composting in FWC and SSC indicates that the immobilisation of P in orga nic forms was not a major pathway for P transformation.

compost composting time isotopic exchange kinetic phosphate 


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  1. Adani F, Genevini PL, Gasperi F & Zorzi g (1997) Organic Matter Evolution Index (OMEI) as measure of composting efficiency. Compost Science & Utilization 5: 53–62Google Scholar
  2. Alt D, Peters I & Fokken H (1994) Estimation of phosphorus availability in composts and compost/peat mixtures by different extraction methods. Commun Soil Sci Plant Anal 25: 2063–2080Google Scholar
  3. Ayuso M, Pascual JA, García C & Hernández T (1996) Evaluation of urban wastes for agricultural use. Soil Sci Plant Nutr 42: 105–111Google Scholar
  4. Dinel H, Schnitzer M & Dumontet S (1996) Compost maturity: Extractable lipids as indicators of organic matter stability. Compost Science & Utilization 4: 6–12Google Scholar
  5. Fardeau JC (1996) Dynamics of phosphate in soils. An isotopic outlook. Fert Res 45: 91–100Google Scholar
  6. Frossard E, Bauer JP & Lothe F (1997) Evidence of vivianite in FeSO4 floculated sludges. Water Res 31: 2449–2454Google Scholar
  7. Frossard E & Sinaj S (1997) The isotopic exchange kinetic technique: a method to describe the availability of inorganic nutrients. Applications to K, P, S and Zn. Isotopes in Environmental and Health Studies 33: 61–77Google Scholar
  8. Frossard E, Sinaj S & Dufour P (1996) Phosphorus in urban sewage sludges as assessed by isotopic exchange. Soil Sci Soc of Am J 60: 179–182Google Scholar
  9. Frossard E, Tekely P & Grimal JY (1994) Characterization of phosphate species in urban sewage sludges by high-resolution solid-state 31P NMR. European J Soil Sci 45: 403–408Google Scholar
  10. He XT, Traina SJ & Logan TJ (1992) Chemical properties of municipal solid waste composts. J Environ Qual 21: 318–329Google Scholar
  11. John MK (1970) Colorimetric determination of phosphorus in soil and plant materials with ascorbic acid. Soil Sci 109: 214–220Google Scholar
  12. Kuhn E, Eugster A & Arnet R (1996) Nährstoffgehalte von Komposten aus aargauischen Anlagen. Agrarforschung 2: 81–84Google Scholar
  13. Kuo S (1995) Nitrogen and phosphorus availability in groundfish waste and chitin-sludge composts. Compost Sci & Utilization 3: 19–29Google Scholar
  14. Liang BC, Gregorich EG, Schnitzer M & Schulten H R (1996) Characterization of water extracts of two manures and their adsorption on soils. Soil Sci Am J 60: 1758–1763Google Scholar
  15. Lookman R, Freese D, Vlassak K, Merckx R & Van Riemsdijk WH (1995) Long term kinetics of phosphate release from soils. Environ Sci and Tech 29: 1569–1575Google Scholar
  16. McCoy JL, Sikora LJ & Weil RR (1986) Plant availability in phosphorus in sewage sludge compost. Journal of Environmental Quality 4: 403–409Google Scholar
  17. Paré T, Dinel H, Schnitzer M & Dumontet S (1998) Transformations of carbon and nitrogen during composting of animal manure and shredded paper. Biol Fert Soils 26: 173–178Google Scholar
  18. Pommel B (1982) Aptitude de plusieurs déchets urbains à fournir du phosphore aux cultures. Agronomie 2: 851–857Google Scholar
  19. Requena N, Baca TM & Azcon R (1997) Evolution of humic substances from unripe compost during incubation with lignolytic or cellulolytic microorganisms and effects on the lettuce growth promotion mediated by Azotobacter chroococcum. Biol Fert Soils 24: 59–65Google Scholar
  20. Salcedo IH, Bertino F & Sampaio ESVB (1991) Reactivity of phosphorus in northeastern Brazilian soils assessed by isotopic dilution. Soil Sci Soc Am J 55: 140–145Google Scholar
  21. Sanchez L, Diez JA, Polo A & Roman R (1997) Effect of timing of application of municipal solid waste compost on N availability for crops in central Spain. Biol Fert Soils 25:136–141Google Scholar
  22. Saunders WMH & Williams EG (1955) Observations on the determination of total organic phosphorus. Soil Sci 6: 254i-267Google Scholar
  23. Sharpley AN & Rekolainen S (1997) Phosphorus in agriculture and its environmental implications, In: Tunney H et al (eds) Phosphorus loss from soil to water. pp. 1–55. CAB International, Wallingford, Oxon, UKGoogle Scholar
  24. Sinaj S, Frossard E & Fardeau JC (1997) Isotopically exchangeable phosphate in size fractionated and unfractionated soils. Soil Sci Soc Am J 61:1413–1417Google Scholar
  25. Systat for Windows (1996) Statistics version 6.0. SPSS Inc, USAGoogle Scholar
  26. Van De Kerkhove JM (1990) Evolution de la maturité de trois déchets urbains en cours de compostage. PhD diss INPL Nancy France 77 ppGoogle Scholar
  27. Wen G, Bates ET & Voroney PR (1995) Evaluation of nitrogen availability in irradiated sewage sludge, sludge compost and manure compost. J Environ Qual 24: 527–534Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • O. Traoré
    • 1
  • S. Sinaj
    • 1
  • E. Frossard
    • 1
  • J.M. Van De Kerkhove
    • 2
  1. 1.Group of plant nutrition, Institute of Plant SciencesSwiss Federal Institute of Technology (ETH)Eschikon-LindauSwitzerland
  2. 2.SITALilleFrance

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